Authors:
C. Peña Universidad del País Vasco/Euskal Herriko Unibertsitatea ‘Materials+Technologies’ Group, Escuela Politécnica, Dpto. Ingeniería Química y M. Ambiente Pza. Europa, 1 20018 Donostia/San Sebastián Spain

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K. de la Caba Universidad del País Vasco/Euskal Herriko Unibertsitatea ‘Materials+Technologies’ Group, Escuela Politécnica, Dpto. Ingeniería Química y M. Ambiente Pza. Europa, 1 20018 Donostia/San Sebastián Spain

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A. Retegi Universidad del País Vasco/Euskal Herriko Unibertsitatea ‘Materials+Technologies’ Group, Escuela Politécnica, Dpto. Ingeniería Química y M. Ambiente Pza. Europa, 1 20018 Donostia/San Sebastián Spain

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C. Ocando Universidad del País Vasco/Euskal Herriko Unibertsitatea ‘Materials+Technologies’ Group, Escuela Politécnica, Dpto. Ingeniería Química y M. Ambiente Pza. Europa, 1 20018 Donostia/San Sebastián Spain

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J. Labidi Universidad del País Vasco/Euskal Herriko Unibertsitatea ‘Materials+Technologies’ Group, Escuela Politécnica, Dpto. Ingeniería Química y M. Ambiente Pza. Europa, 1 20018 Donostia/San Sebastián Spain

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J. Echeverria Hexion Specialty Chemicals S.A. Ctra. Navarra, Epele 39 20120 Hernani Spain

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I. Mondragon Universidad del País Vasco/Euskal Herriko Unibertsitatea ‘Materials+Technologies’ Group, Escuela Politécnica, Dpto. Ingeniería Química y M. Ambiente Pza. Europa, 1 20018 Donostia/San Sebastián Spain

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Abstract  

Autocondensation reactions of mimosa and chestnut tannin extracts solutions have been analysed at several pH by differential scanning calorimetry (DSC). Alkaline pH promotes autocondensation reaction of these tannins. Curing reactions between these tannins and hexamine at acid and not strongly alkaline pH have been proved by DSC. Thermal analysis gives insights not only on reactions between tannin and hexamine, but also about water presence on solutions and degradation reactions of tannins. Products obtained from reactions between tannins and hexamine have been analysed by Fourier transform infrared spectroscopy (FTIR). The obtained chemical structures are influenced by both chemical structure of tannin and pH of solution. For mimosa tannin amine and ether groups are obtained while for hydrolysable chestnut tannin amide groups have been detected.

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
1
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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